Villain is 46/21/1.3 over 41 hands and is pretty fishy. He thought for a few sec and called the turn bet, and fired the river quick but not insta quick.

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) -

BB ($66.45)
UTG ($16.60)
MP ($57)
Hero (CO) ($50.50)
Button ($50)
SB ($58.55)

Preflop: Hero is CO with ,
2 folds, Hero bets $1.50, 2 folds, BB calls $1

Flop: ($3.25) , , (2 players)
BB checks, Hero bets $2.50, BB calls $2.50

Turn: ($8.25) (2 players)
BB checks, Hero bets $5.50, BB calls $5.50

River: ($19.25) (2 players)
[color=#CC3333]BB bets $20.50